---
title: K-PS3-1-19
description: Learn how to develop a model explaining the conservation of mass in chemical reactions. Explore NGSS standards and engage in hands-on learning activities.
image: https://www.knowatom.com/hubfs/Right%20Image.png
---
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# 8P.3.1.1.2
Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.
[](https://cta-redirect.hubspot.com/cta/redirect/347944/20eee377-e175-48fe-a039-ae723137a2a6)
Science & Engineering Practices
- [Developing and using models](https://www.knowatom.com/developing-and-using-models)
- [Planning and carrying out investigations](https://www.knowatom.com/planning-and-carrying-out-investigations)
- [Constructing explanations and designing solutions](https://www.knowatom.com/constructing-explanations-and-designing-solutions)
- [Engaging in argument from evidence](https://www.knowatom.com/engaging-in-argument-from-evidence)
- [Obtaining evaluating and communicating information](https://www.knowatom.com/obtaining-evaluating-and-communicating-information)
Disciplinary Core Ideas
- [Weather and Climate](https://www.knowatom.com/weather-and-climate)
- [Conservation of Energy and Energy Transfer](https://www.knowatom.com/conservation-of-energy-and-energy-transfer)
Crosscutting Concepts
- [Patterns](https://www.knowatom.com/patterns)
- [Cause and Effect](https://www.knowatom.com/cause-and-effect)
[](https://cta-redirect.hubspot.com/cta/redirect/347944/b5a1446e-d782-4a5f-a019-0b3b98c8304f)
## Browse 8P.3.1.1.2 Lesson Plans
Grade Ranges All K-2 3-5 6-8
Standards citation: NGSS Lead States. 2013. *Next Generation Science Standards: For States, By State*s. Washington, DC: The National Academies Press. Neither WestEd nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of this product, and do not endorse it.
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